Hi Vincent,
Thank you for the information and testing the case. I double checked the website and tested 2 scenarios to see if this is something that happens whenever any page is assigned to as the homepage or only that specific page (v is for …).
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To test the case I added a Test Page and it worked with no problem in Cornerstone. Then I temporarily assigned that test page as the main homepage of the website from Settings > Reading and again it worked with no problem.
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I temporarily removed the V id for … page as the homepage and the tested the case and it is not working even if that page is not set as the homepage of the website.
The test above shows that the problem is not the fact that there is a theme related problem regarding the homepage, the problem is that specific page.
I suggest that you install the Duplicate Post plugin, and clone that page for testing purposes. Then try to remove the sections one by one and test the page to see which section is causing the issue.
My guess is that the problem is because of the server not being able to handle too many sections regarding the resources these sections need to render in the Cornerstone. You can test my guess by moving your website to another server or your local machine temporarily and see if that very same page works there. If yes then you will be 100% sure it is a server related problem.
Thank you.